Minutes of the DRAGON meeting, Wed, Aug 24, 2005

Present:
 GR (recorder), CV, CQ, MT, JC, DH, RL, DO, BG, BW, HC, LF, AO, CR, LB 

1. Minutes of previous meeting and business arising

  CR: Thomas' talk is now on the TACTIC website tactic.triumf.ca
      under "Publications".

  JC: 

2. Results of 40Ca(alpha,gamma)44Ti  CV

  See attachment for a run summary

  Highlightes:
  - We should have another alert in MIDAS if devices like Q1 are off.
    (This was the case for a long time without being noticed).
  - Is the MD1 current/field calibration still valid for these high masses.
    There where often deviations of about 20 Gauss depending on the selected
    charge state. Saturation of MD1?
  - Got 78 coinc. recoils for a three-hours run.
  - Final slits were wide open (30 mm). 20 mm opening result in 20% loss of
    recoils
  - Got slightly different yields for 4, 6, and 8 Torr, maybe due to a slight
    change in the charge state?
  - There are still problems with the slits. DH: We need an independent
reading.
  - SiN booster was in a good constitution.
    On a photograph a clear beam spot can be seen, similar to what has been
    demonstrated in the TUDA run last December.
  - The FCM bias has no effect on the current, even though the readback shows
    "on" or "off" state.

3. 26Al(p,g)   CR
  Everything of Chris' analysis is reported in the Elog
  http://elog.triumf.ca/Dragon/E989
  Highlights:
  - Made a detailed probability analysis for each possible background event
    and random coincidence.
  - After the DSSSD was exchanged the leaky beam line was almost at the same
    energy as the recoils. All other criteria like TOF, BGO z-position or
    DSSSD strip nr. are not sufficient for a clear separation.
    So there is no way to separate leaky beam from recoils until it is
understood
    what happened with the detector. A possible layer build-up would affect
    leaky beam and recoils in a similar manner and they should be still
separated.
  - DH: Angular distribution program not yet working, so there are no news.

4. 22Na(p,g)   JC, LF
  - Seattle checked the beamline and equipment. Now gathering equipment from
    DRAGON and environment. Needs g-Detector. The NaI JC found is from AO.
    AO also has a passive shield for it.

5. AOB
   DH: isdaq04 has been replaced. All data from the tapes have been restored.
   CR: Even if they are not always labeled, you see a clear software label
       when the tape is inserted.

   LB: There will be a nuclear theory course, Tuesdays and Thursdays by Byron
       Jennings. Tuesday lectures overlap with the DRAGON meeting and we
       should consider another time.